| add_metadata | Add metadata attributes to a data frame |
| as_rcdf | Convert to 'rcdf' class |
| rcdf_list | Create an empty 'rcdf' object |
| read_env | Read environment variables from a file |
| read_parquet | Read Parquet file with optional decryption |
| read_rcdf | Read and decrypt RCDF data |
| write_parquet | Write Parquet file with optional encryption |
| write_rcdf | Write data to RCDF format |
| write_rcdf_as | Write RCDF data to multiple formats |
| write_rcdf_csv | Write RCDF data to CSV files |
| write_rcdf_dta | Write RCDF data to Stata '.dta' files |
| write_rcdf_json | Write RCDF data to JSON files |
| write_rcdf_parquet | Write RCDF data to Parquet files |
| write_rcdf_sav | Write RCDF data to SPSS '.sav' files |
| write_rcdf_sqlite | Write RCDF data to a SQLite database |
| write_rcdf_tsv | Write RCDF data to TSV files |
| write_rcdf_xlsx | Write RCDF data to Excel files |